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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96807c96c8e311b99c9ad27e1da9f4fcab9d2b311e90dda335a254737e58051' 
  AND token = '2lksY7fI1NyfsF0cF9MPVAsNRyiB6WubjDSE6W2WqQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}